A clever tunnel-shaped action block that gives the illusion of changing the color of a marble. By a clever sleight of hand, the ball goes inside the block and comes out in another color. An easy-to-master magic trick that is sure to have a spectacular effect in a GraviTrax marble run!
 
Infinitely modular and compatible with all GraviTrax products. This action block is played with at least one Starter Set (essential to get started) and then combines with all GraviTrax elements. Discover a wide range of expansion sets and action blocks to enrich your circuits and imagine an unlimited number of different courses.